From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751120AbaHRMVI (ORCPT ); Mon, 18 Aug 2014 08:21:08 -0400 Received: from mail-la0-f41.google.com ([209.85.215.41]:49831 "EHLO mail-la0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750710AbaHRMVG (ORCPT ); Mon, 18 Aug 2014 08:21:06 -0400 Date: Mon, 18 Aug 2014 15:20:56 +0300 From: Andreea-Cristina Bernat To: joro@8bytes.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org Cc: paulmck@linux.vnet.ibm.com Subject: [PATCH] iommu: Replace rcu_assign_pointer() with RCU_INIT_POINTER() Message-ID: <20140818122056.GA29961@ada> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The use of "rcu_assign_pointer()" is NULLing out the pointer. According to RCU_INIT_POINTER()'s block comment: "1. This use of RCU_INIT_POINTER() is NULLing out the pointer" it is better to use it instead of rcu_assign_pointer() because it has a smaller overhead. The following Coccinelle semantic patch was used: @@ @@ - rcu_assign_pointer + RCU_INIT_POINTER (..., NULL) Signed-off-by: Andreea-Cristina Bernat --- drivers/iommu/dmar.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c index 9a4f05e..da9220b 100644 --- a/drivers/iommu/dmar.c +++ b/drivers/iommu/dmar.c @@ -246,7 +246,7 @@ int dmar_remove_dev_scope(struct dmar_pci_notify_info *info, u16 segment, for_each_active_dev_scope(devices, count, index, tmp) if (tmp == &info->dev->dev) { - rcu_assign_pointer(devices[index].dev, NULL); + RCU_INIT_POINTER(devices[index].dev, NULL); synchronize_rcu(); put_device(tmp); return 1; -- 1.9.1